#include <bits/stdc++.h>
using namespace std;
using ll = long long;
using pii = pair<int, int>;
#define rep(i, a, b) for (int i = (a); i <= (b); i++)
#define per(i, a, b) for (int i = (a); i >= (b); i--)
#define endl '\n'
const int N = 2e5 + 5;

int n, m;
int a, b, c;

int main() {
  ios::sync_with_stdio(0), cin.tie(0), cout.tie(0);
  cin >> a >> b >> c;
  bool res = (a == b && b == c) || (max({a, b, c}) * 2 == a + b + c);
  cout << (res ? "Yes" : "No");
  return 0;
}